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https://issues.apache.org/jira/browse/HBASE-3787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13570356#comment-13570356
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Andrew Purtell commented on HBASE-3787:
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Hey, Anoop, great!
bq. When we get a request from client(retry) and old request is in progress, if
we throw exception how the user will know whether the operation was success or
not?
I suggest something like OperationInProgressException and
OperationAlreadyCompletedException. The latter at least should inherit from
DoNotRetryException. In lieu of a different protocol for client<->server
communication.
bq. When we get a request from client(retry) and old request is already
completed and operation was successful, I think we need to make that request a
successful one. Ultimately the operation was successful and the client has no
knowledge abt that.
See above. The client will have enough knowledge to return success to the
application.
> Increment is non-idempotent but client retries RPC
> --------------------------------------------------
>
> Key: HBASE-3787
> URL: https://issues.apache.org/jira/browse/HBASE-3787
> Project: HBase
> Issue Type: Bug
> Components: Client
> Affects Versions: 0.96.0, 0.94.4
> Reporter: dhruba borthakur
> Priority: Critical
> Fix For: 0.96.0
>
>
> The HTable.increment() operation is non-idempotent. The client retries the
> increment RPC a few times (as specified by configuration) before throwing an
> error to the application. This makes it possible that the same increment call
> be applied twice at the server.
> For increment operations, is it better to use
> HConnectionManager.getRegionServerWithoutRetries()? Another option would be
> to enhance the IPC module to make the RPC server correctly identify if the
> RPC is a retry attempt and handle accordingly.
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